A bone anchoring device is provided comprising an anchoring element comprising a shank (14) to be anchored in a bone or a vertebra and a head (15), the head having an exterior surface with a spherical segment-shaped portion (16), wherein said shank (14) and said head (15) are separate partsa receiving portion (1) comprising a first end (2), a second end (3) opposite to the first end, a longitudinal axis (4) passing through the two ends, a bore (5) coaxial with the longitudinal axis, a first region (7) adjacent to the second end (3) for receiving a spherical segment-shaped section (16) of said headand an element (172021) which exerts pressure on said head (15) to lock said head in the receiving portionwherein said head has hollow inner portion (25) to receive a free end portion (22) of said shank and wherein said head and said end portion are formed such that the end portion is elastically clamped by said head while said head is not locked.(Fig. 1)本案提供一種骨骼固定裝置,包括:固定元件,有要固定於骨骼或脊椎之幹部(14),和頭部(15)。頭部外表面呈球形截頭部(16),其中該幹部(14)和該頭部(15)為分開組件;接納部(1)包括第一端(2),與第一端對立之第二端(3),通過二端之縱軸線(4),與縱軸線共軸之腔孔(5),鄰接第二端(3)之第一區(7),供接納該頭部之球形截頭部(16);和元件(17;20;21),對該頭部(15)施壓,把該頭部鎖定於接納部內;其中該頭部具有空心內部(25),以接納該幹部之自由端部(22),又其中該頭部和該端部係形成,在該頭部未被鎖定時,端部被該頭部彈性夾持。1...接納部2...第一端3...第二端4...縱軸線5...共軸腔孔6...開口7...球形段9,10...自由股部11...陰螺紋15...頭部15a...頭部在開口突出部16...球形外表面17...施壓元件20...桿21...內螺釘22...錐形端部24...錐形腔孔30...六角形凹部
